Packing for pistons.



No. 885,652. v .BATENTED APR. 21, 1908.

J. A. snow; PACKING FOE PISTONS.

3 SHEETS-SHEET 1 lPPIiIOATIOH FIL ED MAY 25, 1906.

W/ TN SSES ATTOFNEY' 2. PATENTED APR. 21 1908. M J. A; scoTT.

PACKING FOR PISTONS. I

AYPLIOAIfION 311.31) MAY 25, 1906. 3 SHBET'S SHEET Jjt'a.6.- v Q zy aa PATENTED APR 21,1908.

momma FOR PISTONS. APPLICATION FILED MAY 25, 1906'.

J. A. SCOTT.

3 SHEETS-SHEET a.

- of the city and State rings so that they may be easily and uickly assembled on the I accompanying drawings in which the same I tion, part being removed to K of Fig. 1.

- view showingthefi-lse of a plurality ofpack no. assess.

said rod bein I A UNITED STATES BATENTOFFIGE. i

JOSEPH ALVAH soor'r, or NEW YORK,

To all whom 'itmay concern: I Be it known that 1, Josnrn ALVAH Soon,

a citizen of the United States, and a resident of New York, have in-' vented certain ne wand useful Improvements. in Packings for Pistons, of which the following is a specification. y invention relates to packings for pistons comprising annular packing and wearing or centering rings, an to the manner of and means for mountin the rings u on the piston body so that said rings mayv held securely in place while being permitted to expand freely against the side of the cylinder. It also relates to .means'for securin' the iston and remove therefrom when desired? 2 My invention. will be best understood from the description of the several embodiments thereof which have been selected for illustration. These embodiments are show'n in the reference characters refer. in the diiferent views. Referring to the drawings; Figure 1 is a plan view of a preferred form ofmy invenmore clearly show the construction. Fig. 2 is a sectional view 'of the complete device ontheline 2-2 Fig. 3 is a viewsimilar toFig. 1, of a modified form of the invention. Fig.4 is a' sectionalview of the complete device on the line 44 of Fig.3. Fig. 5 is a. sectional view of a-modification. Figs.' 6 and 7 are views of details of the construction shown in Fig. 3. I Fig. 8 is a View of a modified formof centerin screw-for the continuous packing ring. F1 9 is a View similar to Fig. 1' ofjanother mo 'fication of the invention. Fig. 10 is aview, partlydn transverse sectionas the line 1010, of Fig. 9. Fig: 11 is a view similar to Fig. 10,0f another modificatiomand Fig. 12 is a detail view of the expansible connection between. the segments of' the segmental packing rings. Fig. 13.ista.= sectional to the same pa t mg rings and centering rings: es eciallyadaptedfor use in high pressure cy 'nders.

In the embodiment'of my invention shown in Figs. 1 and 2, the pistoncomrisesa'hol low casting 1 having a central ub 2 bored at3 to receive the endof the piston od 4,-

tapered to have a dri ng fit tapered opening 3 of the pis-'.

in the similar y Specification otliottar Patent. Application means, nu, ma. saw at. 818. 5

together and position by a threaded key 6. 'Torstrengthen andto provide/further supgoi't the hub .-or centering vent them from rotating nuts 20are' 'screwed down over their upper 21 at the bottom of 85 l urge-1" diameter keepi to t I N. Y., Ass1enoa T0 cocnsunn BAnRowc MACHINE COMPANY, OF JERSEY'QITY,NEW JERSEY, A oonrona'rron or newts-Rena. v

.: Patented s an e1, 1e08,

ton. The rod 4 is threaded to receives not ,5, by which the piston and rod are secured, the nut is preferably lockediaf the casting 1 for the packing rings, ribs 1 radiate 2 to the perimeter of the casting To receive the. packing rings 7 andw ring 8; respectively,the piston is provided with the a'm'm eter of the ive an annular holding ring or follower plate cure the "packing mitsfree expansion of said rings against the sides of the cylinderl I g p v The rin or plate 12 is secured to the piston casting 1 y m'eans of stud bolts 15 which are screwed into lugs 16 upon the ribs 1, said bplts being squared at 17 to enter similar apertu'resj18inthe bottom of the bolt receiving 30 recesses 19 "in said holding rings 12, The stud bolts 15 pre- 1 when the clamping f squaredportions 17 of the ends 'upon the washersthe recesses-19.. This squared portion of the 1 stud bolts may, however, be' dis ensed with, 7 but other means of locking may for instance, headed boltscould be used wit .lockingplates placed in recesses The-packing rings 7, centering ring 8and packing rin s 14, as ,before described; are ar- .ranged in 1; respectively of the piston casting 1." The v centering ring 8 is continuous or solid,-and' 95 e annular recesses 9, 10, and 13 a groove consists ofa circular oasting havingl or p ates 22 in its perimeter toreceive' a ban 28m metal which constitute the wemn metend! proper. Thevring 8 isof somewhat recess 10, and to 05 than the p the ring properly" centered with respect e' piston casting 1, provide adjusting screws 24, niountedm lugs 25 on the piston castin which screwsfbearagainst the inner face 0 said ring. When the ring is properly 0 adjusted the screws are locked in position by lock nuts 26.; The packing. rings .71 and'14- are alike-and coin rise segments having overlapping ends 27, ig. .Asplit spring band 28 1s interposed between the segments of the 6 m. 'larrecesses 9 and 10,and one face of the pieton, preferably the rear or top as here'shorvn, is further recessed at 11 to: rec

12, whiciiitself". has an annular recess 13 to receive another 7 .packingring 14. Said ring '12 serves to rings upon the perimeter, of the piston, while,at. the same time it pere provided; I

rings 7 and 14 and the bottom of the recesses 9 and 13, whereby said segments are uniformly expanded outwardly and against the interior wall of the cylinder. For mi ost efl'ective action it is necessary that the ends of the spring bands 28 be staggered with respect to the joints of the segmental rings 7 and 14, and to this end one of said segments is provided with a pin29 which projects between; the ends of the ring 28.

In the modifications shown Figs. 3 to 7 inclusive, and which is'. intended for pistons of comparatively small diameter, the annular plate 3fiavlnch corresponds to; the holding ring- 12 of Figs. 1 and 2,-is of a width to extend-substantially from the perimeter to the i hub of the piston castin 31, 5.], uIn t his '-'b construction the centra centering rin 32 of substantially the same construction as heretofore described but the Wearing mate- ..rialis in the formof' plates 33 whose sides are arranged diagonally to the circumference so that one end of the plate overlaps lon itudinally the plane of the opposite end of tile adjacent plate, thus forming in effect a contin uous wearing surface circumferentiall of the ring, In this construction these a justing screws 34 are spaced 120 degrees a art to hold the ring in proper.- position an to adjust it centrally, as above described, The packing rings in this construction are'of the same'ccnstruction and arrangement as the rings 7 and 14 in Figs. 1 and In Figs7 is clearly shown at 36 an end viewof the overlapping end of one of the segments 4 of the rings 35.

In Fig. 8 is illustrateda modified form of adjusting screw -37, having an aperture 38 which may receive a suitable key by which 40 said screw may be adjusted.

- In the modification shown in Figs. 9 to 11 inclusive, the piston body comprises two complemented castings 39 and so, having hubs id and tQ'respe'ctiVeIy which are boredto receive the piston rod 43. The nut 44 by which the piston and red are secured together, serves at the same time to. secure together the castings 39 and 40, so that the pis ton may be'h'eld assembled by a single-nut. The castings-39' and 40 are held in alinement independently of the rod '13 by means of an annular rim 45 on one of themwhich fits into an annular recess 46 in the other, adjacent the rod receiving here. In this construction the adjusting screws for the central acking ring 47 are dispensed with and the atter is fitted directly upon the outer extremities of the radiating ribs 48 Of l3l16 castings 39 and 40; In Fig. 11 this central ring is, shown as solid in crossseetion. I t

In Fig. 12 means are shown for limiting the outer expansion of the packing rings 49, which comprises a slot 50 in the overlapping end of one of the ring segments, arranged to recelve a pin 51 secured to-th adjacent end ig'expansion of this ring is impossible.

' further set forth.

l of the next segment. hen the parts are in the position shown in this :liguro, further This construction serves, moreover, to hold the segments together'whcn the )lStOD. is rc- I moved from the cylinder. The remaining elements of this construction shown in Figs. '9 to 11 are similar to the corresponding parts heretofore described and hence need not be In Fig. 13 I have shown a construction in which a plurality of. packing rings and wearing or centering rings are used. This construction is especially adapted to high pressure" cylinders. Such a construction rer uces the liability of leakage between the two sides i the piston. Leakage between any enact the rings and walls of the cylinder will be stopped by the following rings. In thislconstruction the centering rings 8 are provided '.-with recesses 10 into which is fitted the acking rings 7 and the split s ring bands 23. j n this construction, one of t to two complemental castings 39 and 40, are shown "slotted s in Fig. 11, but one, 40" l.)ein

much. thicker than the other 39. 'lhese two com lemental castings are also provided wit the annular rim 14- and recess 45.

In Fig. 70f the drawing I have provided the walls or main body of the piston with 0 enings or holes a, which communicate with t e recess or space b behind the annular split ring 28. This permits variation of pressure and forces the packing rings to bear against the cylinder wall in accordance with the pressure in the cylinder on the respective sides of the piston. \Vhile I have shown this construction only in Fig. 7, it is to be understood that it can be ap )lied to the con structions shown in any of the figures of the drawing. As many changes could' be made in the'above construction and many apparently'widely diil'erent embodiments of my invention could be made without deparling from the scope thereof, I intend that all matter contained in the above description or shown in the accompanying drawings shall -\be interpreted as illustrative and not in a.

limiting sense. I desire it also to be understood that the language used in the following claims is intended to cover all of the generic andspecific features of the invention herein described and all statements of the scope ol" the invention, which, as a matter of language, might be said to fall thercbetween.

Havingnow described my invention, what I-claim as new and desire to secure by Letters Patent is:

v 1'. A .piston comprising a body portion,

- having ts perimeter ann'ularly recessed, a 5

plurality ofsegmental packing rings and a wearing or centering ring'arrangcd in saidrecess, annular holding means rcmovably se cured to said body portion to hold said rings securely upon sald piston, while permitting movably secured thereto, and

ring. i 1

2. A piston comprising abody portion, havm 1ts perimeter annularly recessed and provir ed with arece'ssed' holding means reacking means in the recesses of the bod and iolding means comprising a plurality 'o segmeptal expansible packing rings, a wearing or centering ring, and means for radially adjusting the wearing or centering ring. i

3. A piston comprising a body portion having its perimeter annularly recessed, and

packing means in the recess, means including anexpanslble a wearing or centering ring said packing packlng ring, provided externally with a separately-formed wearing Glee ment arranged approximately in the plane of the outer surface of the expansible ring, and means for adjusting the wearing or centering ring.

4. A piston comprising a body portion,

having its perimeter annularly recessed, a

plurality of segmental packing rings and a plurality of wearing rings arranger! in said recess, and annular holding means removably secured to said body ortion to hold said rings securely upon said piston, while permitting free radiakmovement of said rings. i a

' 5. A piston comprising a body portion having its perimeter annularly recessed, a plurallty of spring expansible segmental packing rings and a non-expansible Wearing or centering ring arrange in said recess, means to adjust said non-expansible ring radially with respect to said piston, and an annular ring to hold said rings upon said piston. 6. In a piston packing, a plurality of segmental packing rings, a wearing or centerin ring, an annular holding ring to secure sai rings in position, means for securing said holding rings in position, comprising bolts, each having a threaded portion to enter corresponding threaded bores in said piston, a squared portion toenter similarly shaped apertures 1n said ring, and a threaded portlon to receive a securing nut.

7 'A piston comprising a body portion, having annular recesses in its perimeter, packing means in said recesses comprisin segmental rings, split-spring rings inter oser between said segmental-rings and sai pis ton, and means to maintain the joints of said segmental rings and the 9|.(lS of said split rings in staggered'rclation.

8. A piston packing ring, comprising segmental spring expansible sections, and means comprising a pin and slot connection to limit the extent of expansion of said section. 9. A piston comprising a body portion, consisting of a casting having a hub and oppositely dis osed face plates, ribs radiating from the hu to the perimeter of said casting, an annular recessin said perimeter, a plurality of segmental packing rings, and a pluralty of wearing or centering rings in said recess.

10. A acking for a piston, comprising a segmenta ring, the segments 5f which have overlapping ends, ends arranged to permit and to limit expansion and contraction of said ring. j

11. A piston comprising a body portion,

having an annular recess in the circumfer- 1 ence thereof, a centering ring arranged in' said recess, a acking ring also in said recess, and a spring hand behind the acking ring, .there being a space between sai s ring band and the body of the piston, and tii the piston having an o ening therein which communicates with sair space.

In Witness whereof I have hereunto set my hand at the city, county and State of N ew York, this eighteenth day of Ma 1906.

. JOSEPH ALVA -I SCOTT.

In presence ofi T. R. RICHARDS,

JOHN J. RANAGAN.

e body of 

